下图是某高等动物（基因型Aa）体内正在分裂的四个细胞，下列说法正确的是
| A．甲图表示的细胞中有两个染色体组 |
| B．卵巢内会出现这四种细胞，乙图表示次级卵母细胞 |
| C．如果甲图1号染色体上有A基因，一般情况下，染色体4和8上有a基因 |
| D．乙、丙、丁细胞均含有同源染色体 |
Do you like watching ping﹣pong matches？
Yes，and ________ favorite ping﹣pong player is Ma Long．（ ）
| A． |
we |
B． |
us |
C． |
our |
D． |
ours |
Our reading club shares ideas with each other ________ one hour every Tuesday．（ ）
A．toB．onC．atD．for
Mary wants to be ________ good doctor when she grows up．（ ）
| A． |
a |
B． |
an |
C． |
the |
D． |
/ |
Do you know ？
Yes．They're from new York．（ ）
| A． |
what do the tourists do |
| B． |
where the tourists are from |
| C． |
what the tourists do |
| D． |
where are the tourists from |
The Smiths have decided a house near the sea．（ ）
| A． |
buy |
B． |
bought |
C． |
buying |
D． |
to buy |