正确答案是（）
A. if only
B. now that
C. so that
D. even if
Which of the following is NOT true according to the conversation？
A. Doctors will try plastic teeth on people.
B. Doctors have made plastic teeth work on animals.
C. Toothache always bothers people.
Doctors are trying to transplant a person's tooth to another person.
In the second paragraph, the author seems to consider the Allied bombing on Germany
A. imprudent.
B. immoral.
C. justified.
D. reckless.
As the mountains were covered with a __________ of cloud, we couldn't see tbeir tops.
A. coating
B. film
C. veil
D. shade
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