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【简答题】
A、B、C、D四种元素，A元素组成的一种是自然界最硬的物质，B元素是生物细胞中含量最高的元素，C元素原子核内只含一个质子，D + 离子核外有10个电子． 则（1）A元素组成这种的名称______，B元素是______，D + 离子符号为______． （2）由B、C、D三种元素形成的化合物的化学式为______．
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反馈参考答案：
举一反三
【单选题】---Have you seen Tom and Mary? ---I haven' t seen _____of them.
A.
neither
B.
any
C.
either
D.
all
【简答题】副交感舒血管纤维兴奋引起的反应是 :
【单选题】—'Have you seen Mary today?' —'No, I think she______ away on her vacation. '
A.
must be
B.
may have been
C.
must have been
D.
might have been
【单选题】----Have you seen Tom and Mary? ----I haven’t seen____ of them.
A.
neither
B.
any
C.
either
D.
none
【单选题】听力原文：M: Hi, Jane. Have you seen Mary in the library? W: No, George. You haven't met her on your way to the classroom, have you? M: No, I was hoping that you have. Maybe we have to find her now. What d...
A.
Go to the classroom again.
B.
Try to find Mary together.
C.
Ask Jane to go to the library.
D.
Tell George to find Mary.
【单选题】听力原文：M: Mary, have you seen Helen this term? Isn't she teaching in this school? W: No, she's fired. Q: Why doesn't Helen teach here? (5)
A.
Because she is ill.
B.
Because she lost her job.
C.
Because she is not a teacher.
D.
Because she gets another job.
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