13.Researchers are trying to()what’s wrong with their experiments.

49.Vegans try to live, as much as possible, in a way that avoids exploiting and being cruel to animals.“his means following a plant-based diet. Vegans do not eat animals or animal-based products like meat, fish, seafood, eggs, honey and dairy products such as cheese. For many vegans, living a committed vegan lifestyle means not wearing clothes made from animal skins and avoiding any products which have been tested on animals.Vegans argue that suffering is caused in the production of these foods. For example, they say that, on some dairy farms, male calves(小牛)are killed because they are too expensive to keep, and cows are killed when they get older and produce less milk. As for honey, vegans say that bees make honey for bee, not for humans, and that bees’health can suffer when humans take the honey from them. Vegans be lieve that the products they use and consume should be free from not just cruelty but any exploitation of animals.The main reason for going vegan is probably that they believe animals and all other sentient(有感知能力的)beings should have the right to life and freedom. However, there are other reasons. Vegans argue that the production of meat and other animal products is very bad for the environment. They point out that a huge quantity of water is needed to grow grain to feed animals in the meat industry. The enormous amount of grain which the meat industry needs often leads to forests being cut down and habitats(栖息地)being lost. In contrast, much lower quantities of grain and water are needed to sustain a vegan diet. In addition, many vegans say that all the nutritious elements our bodies need are contained in a carefully planned vegan diet and that this type of diet helps prevent some diseases.Which of the following could be found in a vegan’s diet?

A. 　 Eggs.

B. 　 Honey.

C. 　 Milk.

D. 　 Potatoes.

89.It was clever()at the answer in two minutes.

A. 　 of him to arrive

B. 　 for him to arrive

C. 　 for his arriving

D. 　 of his arriving

210.It is difficult to distinguish one twin()the other.

A. 　 to

B. 　 by

C. 　 for

D. 　 from

216.She tried hard,()she was unsuccessful.

A. 　 therefore

B. 　 but

C. 　 or

D. 　 unless

102.请选出读音不同的选项。()。

A. 　 spell

B. 　 telephone

C. 　 she

D. 　 very

114.I was on the point of going to bed()Mr.Zhang rang.

A. 　 as

B. 　 when

C. 　 while

D. 　 and

165.请选出读音不同的选项。()。

A. 　 ghost

B. 　 daughter

C. 　 taught

D. 　 through

27.Teachers are some of the most important professionals in the world. They are responsible___21___preparing future generations to become productive and honest citizens, who will___22___to society for the whole of their adult life.Obviously, the most common reason___23___teachers decide to teach is the ability to make a difference. There are many professions that give people the ability to have a( )___24___impact on the world and change people’s lives,___25___few professions have a direct impact on___26___a better society as teachers do. People tend to___27___their teachers for years after they finish school, for good teachers can___28___their students to become something that they___29___thought they could be, or to work___30___a field that they thought they did not___31___.Teachers are also important because they provide___32___for their students. In certain low-income areas___33___some students may not have both of their parents___34___, teachers can provide an important influence that helps their students make the right___35___, even when they are not in the classroom. Generally, teachers’impact on students can last all through their life.以下选项27题答案为()。

A. 　 remind

B. 　 remember

C. 　 reflect

D. 　 review

71.---It seems that she is thinking about something. ---Yes, she cannot remember what key she()to her computer.

A. 　 set

B. 　 has set

C. 　 had set

D. 　 sets

161.请选出读音不同的选项。()。

A. 　 whole

B. 　 while

C. 　 whom

D. 　 whose