题目

在下列过程中，需要采用植物组织培养技术的有几种（ ）①用秋水仙素处理萌发的种子或幼苗，获得多倍体植株②利用花药离体培养得到的单倍体植株③利用基因工程培养抗棉铃虫的植株 ④利用细胞工程培养“番茄马铃薯”杂种植株⑤无子西瓜的大量繁殖 A . 一种 B . 二种 C . 三种 D . 四种 答案：D完形填空。 Tony is four years old. His       (1) name is Brown.      (2) father and mother     (3) doctors .They are very busy and Tony is      (4) home alone . Tony likes drawing very much. He often draws dogs, cocks, foxes and flowers       (5) the floor or on the wall. One afternoon, Tony’s mother buys brushes and many books for      (6). Tony is very happy. After supper his       (7) watch TV, but he begins to draw carefully at the table. “   (8) do you draw , Tony ?” asks his father . “God(上帝) ,” the  (9)       answers. “But we can’t      (10) God and what does God look like?” “When I finish drawing, you will know about it,” says the little boy . 1.                A．last            B．first            C．full  D．call 2.                A．His            B．Her            C．He’s    D．She’s 3.                A．is             B．am            C．are  D．have 4.                A．with           B．at             C．for  D．on 5.                A．in             B．between        C．under    D．on 6.                A．him            B．her            C．he   D．his 7.A mother    B. father    C. parent     D. parents 8.                A．Where         B．What           C．How D．Why 9.                A．girl            B．man           C．boy  D．men 10.               A．look           B．look at         C．see   D．watch