问题 读图填空题

遗传是指亲子间的____________,变异是指亲子问和子代个体间的__________.

答案

相似性,差异

题目分析:遗传是指亲子间的相似性即具有相同的性状,变异是指亲子间和子代个体间的差异即性状的差异,如父母都是双眼皮,生的孩子有单眼皮的有双眼皮的,父母和双眼皮的孩子之间就是遗传,父母和单眼皮的孩子之间就是变异,两个孩子之间也是变异。

点评:此题为基础题,较易,熟记遗传、变异的概念是解答本题目的关键。

完形填空

第二节(共5小题;每小题2分,满分10分)

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Shoppers who carefully plan their visit to the grocery store can save money on their grocery bills.   71 

Shoppers should visit the grocery store on a full stomach by scheduling their trip immediately after a large meal. If that’s not possible, they should find something healthy to eat while preparing a grocery list.   72  

Although having a list and sticking to it is the most important factor in saving money, shoppers must prepare lists wisely in order to save.   73  Many special buys are announced through the local newspapers, so buying the “grocery issue” is worth the investment(投资). However, it’s important to remember that many newer, more expensive products first offered through coupons may not yield enough savings for shoppers to give up the product they usually buy.

74  Once at the store, the shopper who wants to save money should follow a few more rules. The shopper should not stay longer than necessary, because bills go up each minute the shopper is in the store. So, setting a time limit and a cost limit can hold down the bill.   75   If the grocery list is a short one, some shoppers choose to use the small hand-held basket instead of the roomy grocery cart.

A.A carefully planned list should include in – season produce and any items on sale or discounted through coupons (优惠券).

B.Of course, the shopper should stick strictly to the shopping list and resist the temptation to buy additional items.

C.People who are full are less tired and more likely to buy what they want.

D.Now that the shopper has completed the grocery list, it’s time to leave for the store. E.You should keep your shopping list carefully in case you can exchange it for coupons.

F.Most shoppers are less persuaded to buy extra goods when they are not hungry.

G.Shopping when not hungry, sticking to a grocery list, and following a few simple rules will cut down the grocery bill.

单项选择题