Scientists have long worried about a coronavirus
variant that's more dangerous than the original virus in three key ways: It would be more
transmissible, result in more serious illness, and
evade protection from existing vaccines.
The data today says that this variant gets a full checked box for more
infectious, probably gets a checked box for more serious, and at least gets a partial checked box for
immune evasion.
Public Health England analyses have found that two doses of Pfizer's vaccine are still 96% effective at preventing
hospitalizations — and 88% effective at preventing
symptomatic COVID-19 — from Delta cases.
Most consumers are familiar with bar codes. Those black-and white stripes appear on almost every product purchased. Often the codes are scanned at the checkout counter, causing the item
name and its price to appear on__(1) __ the cash register screen and the receipt. This gives a record to the consumer and helps store management monitor inventory.
Many delivery services use bar codes to track the progress of each envelope, package, or crate in transit. Every item__ (2) __a bar code, which is read at a number of points from the moment
it leaves the sender's hands to the moment the recipient accepts the delivery.
An interesting use for the bar code has been developed by a scientist who works with bees. The scientist attached bar codes to the backs of individual bees in order to__ (3) __them and
to follow their movements. Laser scanners at the entrance of the hive read the bar codes to monitor how long each bee had been gone from the hive. By keeping__ (4) __of individual bees, scientists hope to learn more about honey production. Knowing how far
bees travel to gather pollen and how many trips they make back to the hive could eventually help beekeepers predict honey yields.
1.
(A) so
(B) either
(C) each
(D) both
2.
(A) having been issued
(B) issuing
(C) is issued
(D) to issue
3.
(A) identify
(B) mention
(C) contradict
(D) speculate
4.
(A) tracking
(B) to track
(C) tracked
(D) track
解析：
1. 正解(D)。語意為「通常條碼會在結帳區被掃瞄，商品的名稱和價格就 _____ 會出現在收銀台螢幕和收據上。」這邊要考的是雙連接詞用語，因為後面使用and的概念，代表兩者皆要，因此應該要選(D) Both a and b的用法。
3. 正解(A)。語意為「這名科學家將條碼附在每隻蜜蜂的背上，目的是為了要_____他們並且追蹤他們的行動。」這裡首先要注意in order to這個片語，用法是表目的的不定詞片語，因此後面只能加上原型動詞。而從語意來判斷，前面提到蜜蜂背上都有一組條碼，目的是為了要辨認出不同的蜜蜂並且追蹤行動，因此答案應該要選(A)。
