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【简答题】
人类生男生女的奥秘可用如图表示，据图回答问题： （1）写出图中序号所代表的染色体符号 ① ② ③ ④ （2）国家提倡一对夫妇生育一胎子女，符合法律法规条件的可以生育第二胎，假使一对夫妇第一胎生的是男孩，预测第二胎生女孩的机会是 %。
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皮皮学刷刷变学霸
举一反三
【单选题】— ______ does his sister water the flowers? — Once a day. [ ]
A.
How many
B.
How long
C.
How soon
D.
How often
【简答题】由于有价证券是虚拟资本，所以它的价格总额总是小于实际资本额。（ ）
【单选题】听力原文：M: We are having a party Saturday night. Can you come? W: I wish I could. But I work at the hospital on weekends. Why can't the woman go to the party?
A.
Because she is sick.
B.
Because she has to work.
C.
Because she likes to stay at home.
【单选题】听力原文：W: Hello, I'm Mary, but have we met before? M: No, I'm new here. I just started working for this company. What can we learn about the man from the conversation?
A.
He's the boss.
B.
He's a visitor.
C.
He's a new employee.
D.
He's the woman's friend.
【简答题】由于有价证券是虚拟资本，所以它的价格总额总是等于实际资本额。( )
【单选题】——_____________ does she weigh? ——Her ______________ is 50kg.
A.
How heavy; weigh
B.
How many; weight
C.
How much; weight
D.
How much; weigh
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