先天性心脏畸形形成的主要时期是在心脏胚胎发育的（）
A．第1～2周
B．第2～4周
C．第2～8周
D．第4～8周
E．第8～16周
参考答案：C
补全对话，每空只填一词。
This, quarter, speaking, to, see, is, do, visit, can't, you
John: Hello! Could I speak 1 David?
David: 2 ! 3 3 David.
John: Hi, David. Would you like to 5 me this afternoon？I've got a new football.
David: I'd love to. But sorry, I 6 I have to 7 my homework.
John: How about tomorrow?
David: Yes, that's fine. What time?
John: At two forty-five. OK?
David: 8 to three?
John: Yes. See you tomorrow.
David: 9 10 then.
人乳中的乳糖的含量高于牛奶为( )。
A．3%
B．8%
C．.6%
D．15%
