rmativ
nt
Each of us carries just over 20,000 genes that encode everything
from the keratin in our hair down to the muscle fibers in our toes. It's
no great (1) (own / came / where / from / our / mystery / genes): our
parents bequeathed them to us. And our parents, in turn, got their
s genes from their parents. But where along that genealogical line did
each of those 20,000 protein-coding genes get its start? That question
has hung over the science of genetics (2) (ago / dawn / century / since /
a / ever / its). "It's a basic question of life: how evolution generates 1
novelty," said Diethard Tautz of the Max Planck Institute for
10 Evolutionary Biology in Plön, Germany. New studies are now bringing
the answer into focus. Some of our genes are immensely old, perhaps
(3) (to / way / back / dating / all the / the) earliest chapters of life on
earth. But a surprising number of genes emerged more recently.
many in just the past few million years. The youngest evolved after our
15 own species broke off from our cousins, the apes. Scientists (4) (being /
finding / into / are / genes / come / new) at an unexpectedly fast clip.
And once they evolve, they can quickly take on essential functions.
Investigating how new genes (5) (understand / help / become / scientists /
important / may / so) the role they may play in diseases like cancer.
[1] Read the passage and rearrange the seven words in (1) - (5) in the correct
order. Then choose from 1-4 the option that contains the third and fifth words.
(1) 13rd: our
(2)
(3)
(4)
(5)
5th: genes
3rd: ago
5th: since
3rd: back
5th: the
2 3rd: where
5th: came
2 3rd: its
5th: ever
23rd: the
5th: back
2 3rd: genes
5th: into
1 3rd: genes
5th: being
1 3rd: may
5th: scientists
3 3rd: scientists
5th: understand
3 3rd: genes
5th: from
3 3rd: its
5th: a
3 3rd: way
5th: back
3 3rd: finding
5th: genes
23rd: important
5th: help
43rd: help
3rd: own
5th: came
3rd: came
5th: dawn
43rd: the
5th: the
4 3rd: new
5th: come
5th: understand
may
may understand thep
(早稲田大)
wystery.
ne
TOL
Recome Sc
