题目

When a pencil is partly in a glass of water, it looks as if ＿＿＿＿.A. breaks     B. has broken  C. were broken     D. had been broken 答案：C 解析: as if引导的从句，如果所说内容与事实不相符时，常用虚拟语气。此题是一种自然现象，故应用一般过去时。注意比较It seems／looks as if it is going to rain.(看起来天将要下雨。)右图为某区域等高线分布状况，等高距为 200m。完成1～2题。 1．图中a和b的数值可能是                                                  A．100   250      B．100   350 C．500   250      D．500   350 2．图中箭头正确表示河流集水方向的是                          A．①    B．②    C．③    D．④