问题
单项选择题
妊娠几周可见到胎心搏动：
A．4～5周
B．3～4周
C．5～6周
D．6～7周
E．7～8周
答案
参考答案：C
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妊娠几周可见到胎心搏动：
A．4～5周
B．3～4周
C．5～6周
D．6～7周
E．7～8周
参考答案：C
| 用下面方框中所给短语的适当形式填空。 | |
2. The farmer grows vanous kinds of crops, ______ wheat, com, cotton and rice. 3. We don't know why his performance didn't ______ to his usual standard. 4. You should pay more attention to your study ______ because you are a student. 5. They had to stay at home instead of going shopping ______ a heavy rain. |